Pressure pump of the rotative type



Oct. 27, 1942; J.ISAAD I 31 PRESSURE PUMP OF THE ROTATIVEL TYPE Filed May 28, 1941 3 Sheets-Sheet l INVENTOR JORGE SAFID I BY 7 m, 4 5, "4

ATTORNEYS Oct. 27, 1942.

J. SAAD PRESSURE PUMP, OF THE ROTATIVE TYPE Filed May 28, 1941 3 Sheets-Sheet 2 INVENTOR JORGE 51414 D, BY

ATTORNEYS Oct. 27, 1942. J. SAAD PRESSURE PUMP OF THE ROTATIVE TYPE Filed May 28, 1941 3 Sheets-Sheet 3' Ymww INVENTOR JOR G E 5/414 D M M WMMM ATTORNEYS bladesinthe flanimproved chambe an improved as to afford freedom of longitudinal 1 Hm md Patented on. 21, 1942 ssoaesl.

OFFICE PRESSURE PUMP OF THE BOTATIVE TYPE Jorge Saad, Rio de Janeiro, Brazil Application May 28,

1941, Serial No. 395,549

In Brazil J 23, 194.

zClaims.

The present invention refers to pressure pimps for the compression of fluids, andmore particularly, to rotative type referred to in United 2,189,969 of February 13, 1940.

As described in detail in the said United States patent, a pressure pump of that type comprises, broadly speaking, a fixed casing with a central hollow space hollow space in off-center relation therewith and formed with a series of slots regularly arranged along the circumferential periphery thereof, blades slidable in said rotor slots, and floating telescopic pistons mounted over the rotor axle at either side of the rotorand operated by fluid pressure for the endwise sealing of the compreswhich latier is thus defined by the crential wall of the central hollow space the circumferential periphery of the rotor and'the end sealing pistons. Due to the off-centerrelation of the rotor in the said hollow space and the slidability of the rotor slots, when the rotor is moved. the blades are constantly movedby centrifugal forces outwardly of their slots and against the wall of thefixed casing, thereby dividing the whole oi the into aseries of smaller tion side to a minimum'at the point of highest pressure, in this manner providing for the sueto be compressed.

' An object of the present invention is to provide cyclic continuous pressure lubricating system for the whole apparatus in which the lubricating oil under compression is also utilized for the p rpose of operating the telescopic pistons for the cndwise sealing of the compression r.

A further object of the invention is to provide mounting'system for the rotor axle expansion and contraction movements of said as for instance, under temperature variawhich shall at the same time be adapted to allow the lubricating oil to have ready and positive access to the bearings without less of compression.

When in the present specification and the appended claims I refer to the lubricating oil or the main fluid, it is to be understood that it is not yp rpose toreferto'the oneortheotheras being absolutely pur but only substantially so, since in practice, as is well known, the oil septherein; a rotor mounted in said a compression chamber cells which vary in volumetric capacity from a maximum at the sucarators do not succeed in performing a complete and perfect separation, and therefore it may frequently happen that thelubricating oil will carry along a certain percentage of the main fluid or the latter may frequently carry along a certain percentage of the ,unseparated lubricating fluid.

The continuous pressure lubrication system acm closed circuit and is broadly characterized as folat the low pressureor suction side of the apparatus and is carried therefrom,

with pression chamber, gether with the mixture separator where the lubricating oilisseparated from the main fluid, which latter is then led into the respective pipe line, whereas the lubricating oil precipitates and is forced under pressure into a suitable oil reservoir.

ratus where. y means of suitably inter-communicating passages in the apparatus, the compressed lubricating oil operate, the floating teleeither side of the compression to force, with predetermined telescopic elements of each piston against the adjacent end of the rotor and theother telescopic element of the piston against the adjacent cover plate'of the apparatus, and

,play left between and the axle of 49 the rotor, whereupon the lubricating oil is returned into the compression chamber partly through the said space or play between the rotor axle and the end pistons and sages which lead the oil from the bearings into a section of the pipe system which discharges the oil back again at the suction side of the apparatus ready 50 circulation. The pressure with which the telescopic elements of the end pistons are forced against the respective ends of the rotor and the adjacent cover plates of the apparatus is predetermined in accordance with the pressure of the lubricating oil, which is the same as that of the cording to this invention is eifected in cycles in a pressure is discharged from the main fluid, into the com- This oil reservoir is in main fluid, and the areas'oi the end pistons in contact, on one side, with the compressed lubricating oil and. on the other side, with the compressed main iiuid, in a manner such as to provide ior effective endwise sealing of the compression chamber without, however, exercising excessive pressure against the movement oi the rotor, all as described in detail in the above-mentioned United States patent.

The mounting system for the rotor axle with free axial expansion and contraction and with pressure lubrication and without loss oi lubricant and compressed iluid, comprises mounting the axle on bearings characterized by not oiiering any ilxed obstacles capable oi hindering the axial movements of the axle, rendering the bearings and other parts oi the axle needing lubrication communicant with the es provided in the apparatus for the lubricating oil under pressure, and the provision of suitable sealing means arranged in proper cooperation with the bearings.-

For the sake oi clearness', by way of example only, and without any limitation oi the spirit and scope oi the invention, the latter will now be described in connection with a preferred embodiment thereof which is illustrated in the accompanying drawings in which:

Fig. 1 is a vertical, central, longitudinal sectional view oi an apparatus according to the present invention.

Fig. 2 is an end view of the apparatus of Fig.

Reierring to the drawings, Fig. 1 shows the ilxed casing T oi the apparatus having a cylinvoir-D and through a passage V, the said chamber N communicates with an inner chamber formed in the end piston between the telescopic elements J and K, while a further passage V renders this said inner chamber of the end piston communicant with the space between the outer periphery oi the telescopic element J of the end piston and the iixed casing T of the apparatus, this said space terminating into a second chamber N around the outer periphery of the other telescopic element K which chamber N thus surrounds the flrst-mentioned chamber N. From the chamber N the oil passes also into the space Q between the rotor axle and the end piston, and through this space it reaches the compression chamber Z. From the chamber N the oil reaches also the adjacent bearing 0 and through the space between the bearing and the journal oi the axle it reaches the oil chamber P at the end oi the bearing. Through a passage U the oil from the oil chamber P reaches at P, Fig. 1, the external pipe system, and from I", it is led to a regulation device 13, whereirom the oil flows through the return pipe section B to be discharged at the low pressure or suction point A,

' Fig. 2, where it is mixed with the main fluid and is substantially the same as drical bore passing through it. In this bore there is located the slidable blade rotor mounted in oii-center relation by means of the axle or shaft I which rotates in the sleeve-type bearings 0-0, the said cylindrical bore oi the fixed casing being closed at the axial ends thereof by means of end pistons having telescopic sections J--K, and the end cover or head plates M. when the rotor is caused to rotate, the main fluid is drawn in at the suction point A, Fig. 2, the said fluid being then compressed by the rotor in the compression chamber Z, Fig. l, and once thus compressed, it is discharged into the high pressure pipe system at C, Fig. 2. This is in general outline a brief description oi the construction and operation oi the apparatus such as disclosed in the abovementioned United States patent which, oi course, in itself, is not claimed in the present invention. The novel part proper oi the invention will now be taken up in somewhat more detail.

According to the invention, in the particular embodiment thereoi herein described and illustrated in the drawings, a small chamber N for the lubricating oil under pressure is formed between the telescopic element J of the end poston J-K and the end cover plate M of the fixed-casing. Through a passage U, this said chamber N communicates at E with the oil pipe system L which connects the apparatus with the oil resertaken, in admixture therewith, into the compression chamber Z. A section C of the high pressure pipe system communicates the high pressure point G oi the apparatus with an oil separator B. A high pressure pipe system x for the main fluid is in communication with the space oi the oil separator S which contains the compressed main fluid separated from the lubricating oil. while a section L of the high pressure pipe system for the lubricating oil communicates the space oi the oil separator S which contains the compressed lubricating oil separated from the main fluid, with an oil reservoir D for the lubricating oil under pressure. The main section L oi the high pressure pipe system for the lubrieating oil communicates the oil reservoir D with the point I: admitting the lubricating oil under pressure into the apparatus. A spring Y is arranged within the inner chamber, between the telescopic elements J and K oi the end piston, for the purpose of maintaining the said telescopic elements in permanent contact with the adjacent end 0! the rotor and the adjacent cover plate M of the fixed casing, respectively, so that when the apparatus is started in operation the said telescopic elements shall always be acting against the adjacent rotor end and adjacent cover plate of the fixed casing with a minimum pressure capable of permitting the building up of pressure up to the normal operating pressure of the apparatus. The axle I of the rotor is mounted on bearings 0-0 of the ordinary type, free iron! any fixed obstacles which might hinder axial movements 0! the axle. In the embodiment illustrated in the drawings, the oil chamber P, Fig. 1, adjacent to one end of the axle is closed by means of a fixed covering element, while the oil chamber P adjacent to the other end of the axle is closed by means oi a rotary seal H of well-known type which affords effective sealing at the bearings.

The operation oi the improved apparatus according to the invention is as follows:

Since the springs Y cause the end telescopic pistons J-K permanently to provide for a sealing action sumciently efiective to create proper suction conditions and to permit the building up of the pressure to normal value independently of any pro-existent fluid or oil pressure in the apparatus and the fluid reaches the interior seal pipe system, when the apparatus is set in operation, the main fluid is drawn in at the suction point A, Fig. 2, and will carry in admixture therewith a predetermined volume of oil, discharged at A from the return pipe section R, the amount of which oil is duly controlled by means of the regulation device B. The oil thus carried in admixture with the main chamber Z where it effects proper lubrication of the rotor and slidable blades. From the high pressure point G in the apparatus, the lubricating oil in admixture with the main fluid flows through the high pressure pipe section C into the oil separator S. In this oil separator, the oil is precipitated and separated from the main fluid and flows, always under pressure, pipe section L while the main fluid separated from the lubriinto the pressure oil reservoir D,

v eating oil flows into the high pressure pipe system X for the main fluid. Through the main section L of the oil pipe system, the oil under pressure flows from the oil reservoir D to the point E of admission into the apparatus of the lubricating oil under pressure. From the point E, the oil under pressure flows through the passage U into the chamber N where it forces with predetermined pressure the telescopic element J of the end piston J-K against the adjacent end face of the rotor. From the chamber N, the oil under pressure passes through passage V into the inner chamber formed between the tele scopic elements J and K of the end piston, where it forces with predetermined pressure the telescopic element K of the end piston against the adjacent end'cover plate M of the apparatus. From this said inner chamber of the end piston, formed between the telescopic elements J and K, the oil passes through the passage V' into the space around the outer periphery of the telescopic element J and filling up this said space finds its way into the second ,mentioned chamber N around the outer periphery of the telescopic element K, thereby providing an eflective liquid against any possible leakage of the main fluid past the piston rings of the end pistons, from the high pressure region of the compression chamber Z back intothe low pressure region of the same chamber Z. From the first mentioned chamber N, the oil under pressure flows also through the space Q between the rotor axle I and the end piston, where it lubricates this portion of the axle and finds its way'lnto the compression chamber, where it helps the pressure lubrication of this said chamber. From the said chamber N the oil under pressure is also given free access into the bearing 0, thus providing for pressure lubrication of the said bearing and, filling up the space between the Journal and bearing, the oil flnds its way into the oil chamber P of the bearing 0. adjacent the end of the axle. From the oil chamber P of bearing 0, the oil under pressure flows through the passage U and reaches at F the external pipe system and is led through the latter into the regulation device 13, from which point of the compressionaxle I of the rotor is freely mounted on the bearings -0, without any fixed constraint J--K are forced,

through the -isthesameas entirely upon the capacity of n which capacity is to be determined according to in the axial direction, what constitutes a highly valuable improvement, since the axle I will thus be left entirely free in what concerns its axial movements, and in this manner its movements of axial expansion and contraction can take place with entire freedom under the different temperature conditions during the operation of the apparatus, thereby eliminating a serious difficulty that quite frequently impairs the efiicient operation of pressure pumps of this type.

The predetermined pressure with which the telescopic elements J and K of the end piston respectively, against the adjacent end of the rotor and the adjacent end cover plate of the pparatus, is calculated on a basis of unit pressure of the main fluid, which that of the lubricating oil, and the surface crease! the telescopic elements in contact, respectively, with the main fluid in the compression chamber Z and the oil under pressure in chamber N and the inner chamber of the and piston between the telescopic elements J and K, this said predetermined pressure being regulated or adjusted so as to give the most eflective sealing action obtainable without excessive restraint of the motion of the rotor, in a manner similar to that disclosed in the abovementioned United States Patent No. 2,189,969.

It is to be noted that, since the systemof oil circulation accordingto the present invention takes place in a closed circuit and under pressure, so long as there is no leakage the lubrication will be effective and continuous, depending the oil separator,

the purposes for which the apparatus is to be utilized. Therefore, the greater the unit pres sure required from the apparatus, the greater will be the unit pressure of the oil in the closed lubrication circuit. Consequently, it is obvious that the apparatus must find itself in a condition of constant equilibrium.

As previously invention particularly described ,hereinbefore and illustrated in the accompanying drawings has been given by way of example only, for the sake of clearness, and without any limiting effect as to any changes and alterations as may fall within the spirit and scope of the invention, it thus being understood that the invention is limited 00131; by the appended claims.

1. A rotary pressure pump for fluids comprising a, casing having a cylindrical bore extending therethrough. head, plates at opposite ends of the casing closing the ends of said bore, a rotary shaft passing axially through said bore and cocentrically arranged therein, sleeve-type bearings in which the end portions of said shaft are mounted, a rotor mounted on said shaft, blades carried by the rotor and making contact at their outer ends with the cylindrical wall of said bore. said blades being mounted on the rotor for sliding movement in a generally radial and outward direction, an annular piston disposed between each head plate and the adjacent side wall oi the rotors, each piston having telescopic sections adapted to be forced apart axially so that one section bears at its outer end against the corresponding head plate and so that the other section bears at one and directly against the corresponding side wall of. the rotor, the cylindrical wall of said bore and the rotor and the opposing walls of the stated, the embodiment of the .0! said bearing two pistons f0 n a a. comm-em cmmber, compression chamber havin an inlet 6 an outlet. the section of each piston which bears against a side wall of the row: m mmwa its outer end and the plate a mi 011 chamber located adjaeent'the inner end of one sleeves, said teleacopic sections of each piston to hetweem 5, Wmoil chamber. is. oil cmmmrc m the wim end of each slwe, an an BGWR'MSOT, means for delivering under pressure from said outlet ot'tkw msalon chamber m mm oil ail mm"- voir, the 011 sewmtow d oil mewoir veins; adaptedtomaintaintheoilunderpxmummeam to deliver oil under pressurb irom the oil rater m rvoir, mm m @ieiiver oil imam" pregame from time to each of fizsi; oilcnsmbempmageaphcinsmdnntoilchgmfluid and lubricatin on amma mto her. m in mm. am mm .1. oi twagdlymmwb "mu J mm w inalongtheahattto'theaidewkilsotthn into'tmcomchammouimmim oflchzmberatomid-inkt oithe comp cewithcllim 1 has dam 31m .1

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